What is the reason for the decrease in horsepower of Wuling National VI vehicles?

[VonRhett]

The reason for the decrease in horsepower of Wuling National VI vehicles is that the higher the emission standard, the stronger the lag in power response. There are three upgrade scenarios from National V to National VI: The engine hardware remains unchanged, the exhaust emission system is improved, and the software is adjusted to meet National VI emission standards. The engine hardware and software are not changed, as they already meet National VI emission standards, but due to technical reasons, they could only be certified for National V emissions. Both the engine software and hardware are readjusted to comply with National VI emission standards. Exhaust emission technology: The commonly adopted methods include exhaust gas recirculation, three-way catalytic converters, and other exhaust treatment technologies. Although the exhaust gas recirculation system helps reduce nitrogen oxide emissions, the oxygen concentration and combustion temperature decrease during the intake process, slowing down the combustion speed, which leads to a reduction in power and a corresponding increase in particulate emissions such as PM.